AIRBAG SYSTEM, Diagnostic DTC:B1642/81, B1647/82

DTC Code DTC Name
B1642/81 Lost Communication with Side Satellite Sensor Bus RH
B1647/82 Lost Communication with Side Satellite Sensor Bus LH

DESCRIPTION

The circuit for the side collision sensor LH or RH (to determine deployment of the front seat airbag LH or RH, rear seat side airbag LH or RH and curtain shield airbag LH or RH) is composed of the center airbag sensor, side airbag sensor LH or RH, and rear airbag sensor LH or RH.

The side airbag sensor LH or RH and rear airbag sensor LH or RH detect impacts to the vehicle and send signals to the center airbag sensor to determine if the airbag should be deployed.

DTC B1642/81 or B1647/82 is stored when a malfunction is detected in the circuit for the side collision sensor LH or RH (to determine deployment of the front seat airbag LH or RH, rear seat side airbag LH or RH and curtain shield airbag LH or RH).

DTC Code DTC Detection Condition Trouble Area
B1642/81

When one of the following conditions is met:


  • The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the circuit for the side collision sensor RH (to determine deployment of the front seat airbag RH and curtain shield airbag RH) for 2 seconds.

  • A side airbag sensor RH malfunction.

  • A rear airbag sensor RH malfunction.

  • A center airbag sensor malfunction.

  • No. 2 floor wire

  • Front door wire RH

  • Side airbag sensor RH

  • Rear airbag sensor RH

  • Center airbag sensor assembly
B1647/82

When one of the following conditions is met:


  • The center airbag sensor receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the circuit for the side collision sensor LH (to determine deployment of the front seat airbag LH and curtain shield airbag LH) for 2 seconds.

  • A side airbag sensor LH malfunction.

  • A rear airbag sensor LH malfunction.

  • A center airbag sensor malfunction.

  • Floor wire

  • Front door wire LH

  • Side airbag sensor LH

  • Rear airbag sensor LH

  • Center airbag sensor assembly

WIRING DIAGRAM

A01567TE02
A015C5IE02

INSPECTION PROCEDURE

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

  • When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

PROCEDURE


  1. CHECK FOR DTC


    1. Turn the ignition switch off.

    2. Turn the ignition switch to ON, and wait for at least 60 seconds.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1642 and B1647 are not output A
      DTC B1647 is output B
      DTC B1642 is output C

      Tech Tips

      Code other than DTC B1642 and B1647 may be output at this time, but they are not related to this check.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    CHECK CONNECTION OF CONNECTORS Click here

    C

  2. CHECK CONNECTION OF CONNECTORS


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Check that the connectors are properly connected to the center airbag sensor and side airbag sensor RH.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  3. CHECK CONNECTORS


    1. Disconnect the connectors from the center airbag sensor and side airbag sensor RH.

    2. Check that the connectors (on the center airbag sensor side and side airbag sensor RH side) are not damaged.

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  4. CHECK SIDE AIRBAG SENSOR RH CIRCUIT


    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

      A015D21E04

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I9-4 (BBR+) - Body ground Ignition switch ON Below 1 V
      I9-3 (BBR-) - Body ground Ignition switch ON Below 1 V

    3. Turn the ignition switch off.

    4. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    5. Using a service wire, connect terminals 17 (BBR+) and 18 (BBR-) of connector B.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I9-4 (BBR+) - I9-3 (BBR-) Always Below 1 Ω

    7. Disconnect the service wire from connector B.

    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I9-4 (BBR+) - I9-3 (BBR-) Always 1 MΩ or higher
      I9-4 (BBR+) - Body ground Always 1 MΩ or higher
      I9-3 (BBR-) - Body ground Always 1 MΩ or higher

    NG

    CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT DOOR WIRE RH) Click here

    OK

  5. CHECK CONNECTION OF CONNECTORS


    1. Check that the connector is properly connected to the rear airbag sensor RH.

      OK
      The connector is properly connected.

    NG

    CONNECT CONNECTOR PROPERLY

    OK

  6. CHECK CONNECTORS


    1. Disconnect the connectors from the side airbag sensor RH and rear airbag sensor RH.

    2. Check that the connector (on the rear airbag sensor RH side) is not damaged.

      OK
      The connector is not deformed or damaged.

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  7. CHECK REAR AIRBAG SENSOR RH CIRCUIT


    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

      A01570DE04

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I9-1 (BCR+) - Body ground Ignition switch ON Below 1 V
      I9-2 (BCR-) - Body ground Ignition switch ON Below 1 V

    3. Turn the ignition switch off.

    4. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    5. Using a service wire, connect terminals 2 (BCR+) and 1 (BCR-) of connector E.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I9-1 (BCR+) - I9-2 (BCR-) Always Below 1 Ω

    7. Disconnect the service wire from connector E.

    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I9-1 (BCR+) - I9-2 (BCR-) Always 1 MΩ or higher
      I9-1 (BCR+) - Body ground Always 1 MΩ or higher
      I9-2 (BCR-) - Body ground Always 1 MΩ or higher

    NG

    CHECK FRONT DOOR WIRE RH (SIDE AIRBAG SENSOR RH - NO. 2 FLOOR WIRE) Click here

    OK

  8. CHECK SIDE AIRBAG SENSOR RH


    1. A0156CDE12

      Connect the connector to the center airbag sensor.

    2. Interchange the side airbag sensor RH with LH and connect the connectors to them.

    3. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    4. Turn the ignition switch to ON, and wait for at least 60 seconds.

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the ignition switch off.

    7. Turn the ignition switch to ON, and wait for at least 60 seconds.

    8. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1642 and B1647 are not output A
      DTC B1647 is output B
      DTC B1642 is output C

      Tech Tips

      Codes other than DTC B1642 and B1647 may be output at this time, but they are not related to this check.

    9. Turn the ignition switch off.

    10. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    11. Return the side airbag sensor LH and RH to their original positions and connect the connectors to them.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH Click here

    C

  9. CHECK REAR AIRBAG SENSOR RH


    1. A0156AYE10

      Temporarily replace the rear airbag sensor RH with a new one.

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Turn the ignition switch to ON, and wait for at least 60 seconds.

    4. Clear the DTCs stored in the memory Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, and wait for at least 60 seconds.

    7. Check for DTCs Click here.

      OK
      DTC B1642 is not output.

      Tech Tips

      Codes other than DTC B1642 may be output at this time, but they are not related to this check.

    8. Turn the ignition switch off.

    9. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    REPLACE REAR AIRBAG SENSOR RH Click here

  10. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT DOOR WIRE RH)


    1. Disconnect the No. 2 floor wire connector from the front door wire RH.

      A015BRDE02

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      IL1-4 (BBR+) - Body ground Ignition switch ON Below 1 V
      IL1-3 (BBR-) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 17 (BBR+) and 18 (BBR-) of connector B.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      IL1-4 (BBR+) - IL1-3 (BBR-) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      IL1-4 (BBR+) - IL1-3 (BBR-) Always 1 MΩ or higher
      IL1-4 (BBR+) - Body ground Always 1 MΩ or higher
      IL1-3 (BBR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

    REPLACE FRONT DOOR WIRE RH

  11. CHECK FRONT DOOR WIRE RH (SIDE AIRBAG SENSOR RH - NO. 2 FLOOR WIRE)


    1. Disconnect the front door wire RH connector from the No. 2 floor wire.

      A015CHRE08

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I9-1 (BCR+) - Body ground Ignition switch ON Below 1 V
      I9-2 (BCR-) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 2 (BCR+) and 1 (BCR-) of connector C.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I9-1 (BCR+) - I9-2 (BCR-) Always Below 1 Ω

    8. Disconnect the service wire from connector C.

    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      I9-1 (BCR+) - I9-2 (BCR-) Always 1 MΩ or higher
      I9-1 (BCR+) - Body ground Always 1 MΩ or higher
      I9-2 (BCR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FRONT DOOR WIRE RH

    OK

    REPLACE NO. 2 FLOOR WIRE

  12. CHECK CONNECTION OF CONNECTORS


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Check that the connectors are properly connected to the center airbag sensor and rear airbag sensor LH.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  13. CHECK CONNECTORS


    1. Disconnect the connectors from the center airbag sensor and rear airbag sensor LH.

    2. Check that the connectors (on the center airbag sensor side and rear airbag sensor LH side) are not damaged.

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  14. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - REAR AIRBAG SENSOR LH)


    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

      A0155QJE08

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K7-4 (BBL+) - Body ground Ignition switch ON Below 1 V
      K7-3 (BBL-) - Body ground Ignition switch ON Below 1 V

    3. Turn the ignition switch off.

    4. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    5. Using a service wire, connect terminals 24 (BBL+) and 23 (BBL-) of connector B.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      K7-4 (BBL+) - K7-3 (BBL-) Always Below 1 Ω

    7. Disconnect the service wire from connector B.

    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      K7-4 (BBL+) - K7-3 (BBL-) Always 1 MΩ or higher
      K7-4 (BBL+) - Body ground Always 1 MΩ or higher
      K7-3 (BBL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  15. CHECK CONNECTION OF CONNECTOR


    1. Check that the connector is properly connected to the side airbag sensor LH.

      OK
      The connector is properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  16. CHECK CONNECTORS


    1. Disconnect the connectors from the rear airbag sensor LH and side airbag sensor LH.

    2. Check that the connector (on the side airbag sensor LH side) is not damaged.

      OK
      The connector is not deformed or damaged.

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  17. CHECK SIDE AIRBAG SENSOR LH CIRCUIT


    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

      A01584LE15

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K7-1 (BCL+) - Body ground Ignition switch ON Below 1 V
      K7-2 (BCL-) - Body ground Ignition switch ON Below 1 V

    3. Turn the ignition switch off.

    4. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    5. Using a service wire, connect terminals 2 (BCL+) and 1 (BCL-) of connector E.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      K7-1 (BCL+) - K7-2 (BCL-) Always Below 1 Ω

    7. Disconnect the service wire from connector E.

    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      K7-1 (BCL+) - K7-2 (BCL-) Always 1 MΩ or higher
      K7-1 (BCL+) - Body ground Always 1 MΩ or higher
      K7-2 (BCL-) - Body ground Always 1 MΩ or higher

    NG

    CHECK FLOOR WIRE (REAR SIDE AIRBAG SENSOR LH - FRONT DOOR WIRE LH) Click here

    OK

  18. CHECK REAR AIRBAG SENSOR LH


    1. A015CLFE22

      Temporarily replace the side airbag sensor LH with a new one.

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Turn the ignition switch to ON, and wait for at least 60 seconds.

    4. Clear the DTCs stored in the memory Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, and wait for at least 60 seconds.

    7. Check for DTCs Click here.

      OK
      DTC B1642 or B1647 is not output.

      Tech Tips

      Codes other than DTC B1642 and B1647 may be output at this time, but they are not related to this check.

    8. Turn the ignition switch off.

    9. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.


    NG

    CHECK SIDE AIRBAG SENSOR LH Click here

    OK

    REPLACE REAR AIRBAG SENSOR LH Click here

  19. CHECK SIDE AIRBAG SENSOR LH


    1. A0156AYE13

      Interchange the side airbag sensor LH with RH and connect the connectors to them.

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Turn the ignition switch to ON, and wait for at least 60 seconds.

    4. Clear the DTCs stored in the memory Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, and wait for at least 60 seconds.

    7. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1647 is output A
      DTC B1642 is output B
      DTC B1642 and B1647 are not output C

      Tech Tips

      Codes other than DTC B1642 and B1647 may be output at this time, but they are not related to this check.

    8. Turn the ignition switch off.

    9. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    10. Return the rear airbag sensor RH and LH to their original positions and connect the connectors to them.


    A

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    B

    REPLACE SIDE AIRBAG SENSOR LH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

  20. CHECK FLOOR WIRE (REAR SIDE AIRBAG SENSOR LH - FRONT DOOR WIRE LH)


    1. Disconnect the floor wire connector from the front door wire LH.

      A015767E10

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K7-1 (BCL+) - Body ground Ignition switch ON Below 1 V
      K7-2 (BCL-) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 2 (BCR+) and 1 (BCR-) of connector C.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      K7-1 (BCL+) - K7-2 (BCL-) Always Below 1 Ω

    8. Disconnect the service wire from connector C.

    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      K7-1 (BCL+) - K7-2 (BCL-) Always 1 MΩ or higher
      K7-1 (BCL+) - Body ground Always 1 MΩ or higher
      K7-2 (BCL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT DOOR WIRE LH